/*
 * Copyright 2022. Huawei Technologies Co., Ltd. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.huawei.saas.config.balancestrategy;

import com.huawei.saas.config.dynamicdatasource.SnapshotDataSource;
import com.huawei.saas.constants.LoadBalanceStrategyEnum;

import java.util.List;
import java.util.concurrent.ThreadLocalRandom;

/**
 * 随机算法
 *
 * @since 2022-4-22
 */
public class RandomLoadBalanceStrategy implements LoadBalanceStrategy {

    @Override
    public String getStrategyType() {
        return LoadBalanceStrategyEnum.RANDOM.getCode();
    }

    @Override
    public SnapshotDataSource get(List<SnapshotDataSource> dataSourceList) {
        if (dataSourceList.size() == 1) {
            return dataSourceList.get(0);
        }
        return dataSourceList.get(ThreadLocalRandom.current().nextInt(dataSourceList.size()));
    }
}
